165213543 has 16 divisors (see below), whose sum is σ = 241353216. Its totient is φ = 99695040.

The previous prime is 165213541. The next prime is 165213563. The reversal of 165213543 is 345312561.

It is not a de Polignac number, because 165213543 - 2¹ = 165213541 is a prime.

It is a super-2 number, since 2×165213543² = 54591029581225698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165213543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165213541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3055 + ... + 18432.

It is an arithmetic number, because the mean of its divisors is an integer number (15084576).

Almost surely, 2^165213543 is an apocalyptic number.

165213543 is a deficient number, since it is larger than the sum of its proper divisors (76139673).

165213543 is a wasteful number, since it uses less digits than its factorization.

165213543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21734.

The product of its digits is 10800, while the sum is 30.

The square root of 165213543 is about 12853.5420410096. The cubic root of 165213543 is about 548.7171677957.

The spelling of 165213543 in words is "one hundred sixty-five million, two hundred thirteen thousand, five hundred forty-three".